A collection about awesome blockchains - open distributed public databases w/ crypto hashes incl. git ;-). Blockchains are the new tulips 🌷🌷🌷. Distributed is the new centralized.

Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work

A no-nonsense CAPTCHA system with seamless UX | Backend component

GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism and advanced anti-spam filter.

a memory-bound graph-theoretic proof-of-work system

Go Implementation of the Spacemesh protocol full node. 💾⏰💪

The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.

Project dedicated to fight Layer 7 DDoS with proof of work, with an additional WAF and controller. Completed with full set of features and containerized for rapid and lightweight deployment.

Escalation of Privilege to the root through sudo binary with chroot option. CVE-2025-32463

git is a blockchain. Start your commit hashes with 00000000 like a real blockchain should.

JeChain decentralized application platform and smart contract blockchain network

blockchain (crypto) tools, libraries & scripts in ruby

A SDK for implementing blockchain-based digital currencies

C/C++ implementation of Ethash and ProgPoW – the Ethereum Proof of Work algorithms

This is my attempt to list all possible blockchain consensus out there, i welcome pull request of the blockchain community! lets make it the main reference for blockchain consensus

⋰·⋰ Feeless is a Nano cryptocurrency node, wallet, tools, and Rust crate. https://feeless.dev/

Monero POW mining in Python

BitCore (BTX) - Cryptocurrency 220 Byte Datacarriersize

Simple javascript proof-of-work based access for Nginx with virtually no overhead. (Similar to Cloudflare's anti-DDoS feature)

⛓✨ Interactive blockchain built with Node.js